Available for Full-stack & Blockchain Hanoi · UTC+7

Dang Hao

@danqha0

Full-stack & Blockchain Engineer

I build fast web interfaces, reliable AWS backend services, ERC-4337 smart-account systems, and Linux endpoint security tools — taking software from early architecture through live production.

Now: Zinza Technology Full-stack Developer
Education: Academy of Cryptography Techniques 2019 – 2024

Resume / CV

d0 Systems Sculpture Drag to orbit · Select subsystem

Systems & Architecture

Select a discipline to inspect how interfaces, cloud workers, on-chain execution, and Linux policies connect in production.

Slash Core

Smart Contracts & Account Abstraction

Solidity · ERC-4337 · EVM Multichain · Rust

Gas-optimized Solidity contracts, ERC-4337 bundler and paymaster flows for gasless UX, and real-time multichain EVM event indexing.

Smart Account

Intent-based transaction signed once by the user without managing raw native gas balances.

Experience

Production delivery across full-stack web platforms, AWS infrastructure, Solidity and ERC-4337 flows, Linux endpoint DLP, and LLM evaluation.

Jul 2024 – Present Full-time · Hanoi, Vietnam

Full-stack Developer

Zinza Technology

Build and maintain scalable production web applications across responsive frontends and high-availability backend services.
Design RESTful APIs and asynchronous background workers; optimize PostgreSQL/MongoDB queries and Redis caching, and deploy/operate services on AWS and Docker.
Architect, deploy, and test smart contracts (Solidity) across EVM-compatible multichain networks with a focus on security and gas optimization.
Implement ERC-4337 Account Abstraction workflows (gasless transactions, smart contract wallets) and build real-time on-chain event indexing pipelines.
Engineer Linux endpoint Data Loss Prevention (DLP) solutions featuring policy enforcement, sensitive content inspection, and network traffic control.
Evaluate AI models (LLM Evaluation) through systematic prompt engineering, rigorous testing, failure analysis, and structured feedback loops.

Next.js · Node.js · PostgreSQL · AWS · Solidity · ERC-4337 · DLP · Linux · LLM Eval

Mar 2024 – Jul 2024 Internship · Hanoi, Vietnam

JavaScript Developer

Zinza Technology

Built interactive frontend modules in React.js and RESTful API endpoints in Node.js, contributing to code reviews, testing, and feature delivery prior to full-time conversion.

JavaScript · React.js · Node.js

Sep 2023 – Mar 2024 Part-time & Internship · Hanoi, Vietnam

Unity 2D Developer

HN Technology

Developed 2D gameplay systems and interactive features in Unity (C#), implementing character controllers, 2D physics, UI workflows, and scene state management in collaboration with game designers and the technical lead.

Unity · C# · 2D Game Systems

May 2021 – Jun 2023 Part-time · Hanoi, Vietnam

Software Developer

Sellclone

Designed and built Android and web automation tools to streamline device interaction workflows and automated data processing.
Maintained internal web applications with a focus on operational stability and security, while providing direct technical support to end users.

Node.js · C# · Android · Web automation

Selected Scope

Core production systems delivered under client and enterprise NDAs.

Public repositories, architecture notes, and benchmarks are added as disclosure permissions clear.

Full-stack & AWS infrastructure

Production web & cloud systems

End-to-end web application engineering covering interfaces, service logic, data modeling, AWS cloud deployment, and production support.

Next.js · Node.js · PostgreSQL · AWS

Smart contracts & ERC-4337

Blockchain engineering

Designing and integrating smart contracts, ERC-4337 Account Abstraction architectures, and real-time on-chain event synchronization for production applications.

Solidity · ERC-4337 · EVM Multichain

Linux security engineering

Endpoint data protection

Policy-driven DLP capabilities combining sensitive-content detection, network controls, and Linux system components to reduce unauthorized data exfiltration.

Endpoint DLP · Linux · Network Control

Background & Stack

I earned my Information Technology Engineer degree at the Academy of Cryptography Techniques in Hanoi. Starting from systems and security shaped how I build web and blockchain products today: map edge cases early, keep interfaces fast and legible, and leave every service easier to operate than I found it.

Languages: TypeScript, JavaScript, Python, Rust, Solidity, C#
Web & Backend: Next.js, React, Svelte, Node.js, NestJS, REST & GraphQL APIs
Cloud, Data & Infra: AWS, PostgreSQL, MongoDB, Redis, Docker, Linux
Domains: Blockchain (Solidity, Smart Contracts, ERC-4337), Endpoint DLP, LLM Evaluation

Get in touch

Available for full-stack or blockchain engineering roles, technical partnerships, and architecture discussions.

[email protected]

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